滴加法制备聚吡咯包覆的硫基复合材料的性能研究

doi:10.12028/j.issn.2095-4239.2018.0034

摘要/Abstract

摘要： 采用简单的溶液滴加法将颗粒状聚吡咯（PPy）包覆在单质硫（S）表面，制备了S和PPy质量比分别为6∶4、7∶3、8∶2的S/PPy复合材料，探究S/PPy材料最佳合成条件。利用X射线衍射（XRD）、傅里叶红外变换（FTIR）、场发射扫描电镜（FESEM）、透射电镜（TEM）表征手段和电化学性能测试对这3种不同硫含量的S/PPy复合材料的结构和电化学性能进行研究。形貌观察结果表明，当S和PPy质量比为7∶3时（S/PPy-30），PPy颗粒分散均匀，对单质硫包覆效果最佳，同时S/PPy-30也表现出最优的电化学性能，在200 mA/g电流密度下，首圈放电比容量为1151 mA·h/g，循环120圈后，容量剩余623 mA·h/g，相比其他两个比例的S/PPy材料，S/PPy-30的倍率性能也表现出明显的优势。

关键词: 锂硫电池, 正极材料, 聚吡咯, 复合材料

Abstract: S/PPy composite materials with different mass ratios (the weight of sulfur to that of polypyrrole) of 6:4, 7:3, 8:2 were prepared by coating polypyrrole (PPy) on the surface of sulfur with a solution drop addition method to investigate the optimum synthesis condition. The structure and electrochemical properties of S/PPy composites were studied by means of X-ray diffraction (XRD), Fourier transform infrared spectrum analysis (FTIR), field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM) and electrochemical measurements. And the morphology observation results show that PPy granules disperse uniformly and exert outstanding covering effect when mass ratio of sulfur and PPy is 7:3 (S/PPy-30). Furthermore, S/PPy-30 composite manifests best electrochemical performance, which displays high initial discharge capacity of 1151 mA·h·g^-1 and maintains 623 mA·h·g^-1 after 120 cycles at a current density of 200 mA·g^-1. And S/PPy-30 presents distinctive advantage in rate capacity compared to the other two S/PPy materials.

Key words: lithium-sulfur batteries, cathode material, polypyrrole, composite

中图分类号:

TM911

宋育国, 徐娇慧, 刘明雨, 陈筱, 金波, 蒋青. 滴加法制备聚吡咯包覆的硫基复合材料的性能研究[J]. 储能科学与技术, 2018, 7(3): 502-511.

SONG Yuguo, XU Jiaohui, LIU Mingyu, CHEN Xiao, JIN Bo, JIANG Qing. Study on properties of polypyrrole-coated sulfur-based composite prepared by drop addition method[J]. Energy Storage Science and Technology, 2018, 7(3): 502-511.

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